Unit 9: Slope as a Rate of Change (TEST REVIEW)

Please Note: This review follows the outline of unit 9

test VERY closely.  If you are able to complete this review

successfully then you should be prepared for the test.

If you would like to retake the review as extra practice

please let me know and I will reset it for you.

Unit 9: Test Review

Which of the following best represents the y - intercept of

the line shown above?

The graph below represents a linear function.

-4
 3
 4
 -3

Shane's insulation company charges an initial fee of $25,

plus $1.50 for every square foot of insulation sprayed.

Shane graphed y, the amount that his insulation company

charges, as a function of x, the number of square feet of

insulation sprayed.  What does the y - intercept of

 Shane's graph represent?

 The charge per square foot of insulation sprayed

The initial fee

 The number of square feet of insulation sprayed
The total amount owed
Which  function best describes the graph shown below?
 f(x) = 2x + 6
 f(x) = ½x - 6
 f(x) = -2x + 6
 f(x) = -½x + 6

If y is directly proportional to x and y = 24 when x = 4,

the proportion equation is

x = 3y
 y = 3x

 x = 6y

 y = 6x

The slope becomes less steep and the y - intercept

shifts up 8 units.

The slope becomes less steep and the y-intercept

shifts up 6 units.

 

Which best describes the effect on the graph of changing

y = ⅓x - 6 to y = 3x + 2?

 The slope becomes steeper and the y-intercept

shifts down 6 units.

The slope becomes steeper and the y-intercept

shifts up 8 units.

What is the slope from the following table of values?

-5

5

-1/5

1/5
What is the y-intercept from the following graph?
2

3

-⅔

f (x) = x is the

for all linear functions
.
I and III only

Given f(x) = 4x + 12 which of the following is true

of f(x)?

 

I. The Slope is ¼

II. The y-intercept is 12.

III. The x-intercept is -3. 

II and III only
I and II only
III only
Given y = ½x + 6 the zero of f(x) is
-6
12
6
-12

Given the graph of f(x) as shown for

f(x) = -x + b, b is

3

2

4

5

What is the x - intercept of the graph of the equation

y = -¼x - 4

-10

16

10
-16
What is the y-intercept of the equation 4x - y = 16?
4
-4
-16
16
(0,-3)
A linear function is graphed below.
(-3, 0)
(0, -9)

Which ordered pair best

represents the y-intercept

of this function?

(-9,0)
nothing can be determined with the given information
as h increases, p decreases
p is always constant
as h increases, p increases

If the amount of your pay check, p, is directly

proportional to the number of hours you

work, h, Then

 

If 3x - 12y  = 0 is writen as a directly proportional

function, where y is a function of x, then k is

¼
¾
3

If the constant of proportionality for a given directly

proportional relationship is 8, graphically the 8 is

the x -intercept
the slope
the zero
the y-intercept

If a model of the number of chickens in a pen is

b = 3x + 5, where 5 is the initial number of chickens

in the pen, what will happen to the number of chickens

each year, represented by b, if the initial number of

chickens is 1 rather than 5?

The number of chickens will triple each year
the number of chickens will decrease by 4
the number of chickens will decrease by one-fifth
the number of chickens will increase by 1
Is the graph above a function?
Hint: Use the vertical line test.
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